Ignitron Mercury Arc Rectifier Tube from Japan
Ignitrons are large mercury arc rectifier tubes used for high-current DC power conversion in industrial applications like aluminum smelting. HTS 8540.89.00 includes these mercury vapor-filled tubes operating via cathode-initiated arc discharge.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Mercury content declarations mandatory; special hazardous waste handling procedures
• Ozone-depleting substances certification required for mercury vapor tubes
• Legacy equipment replacement; verify if solid-state rectifiers under 8536 more appropriate